Gas-inhaler



(No Model.)

H. R. HURD.

Gas Inha.1er.# No. 234,479. Patented Nov. 16,1880.

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UNrrso STATES PATENT Orrrcn.

HUTSON It. HURD, OF CLEVELAND, OHIO.

GAS-INHALER.

SPECIFICATION formingpart of Letters Patent No. 234,479, dated November 16, 1880.

Application filed September 10, 1880. (No model.)'

To all whom it may concern:

Be it known that I, HUTSON It. HURD, of Cleveland, in the county of Ouyahoga and State of Ohio, have invented new and useful Improvements in Gas-Inhalers, (Case 13,) of which the following is a specification.

The nature of this invention relates to an apparatus for inhaling nitrous oxygen and other antesthetic gases for medicinal and dental purposes.

Said apparatus consists of a flexible mouthpiece or cup provided with a tube, whereby the mouth-piece is attached to a reservoir of gas by means of a hose. Within the mouthpiece is secured to the end of the tube alluded to a valve opened and closed by certain devices attached to the outside of the tube, constructed and operated as hereinafter more fully described, and which is the subject-matter of the improvement above mentioned.

A further and more full description of the invention is as follows, reference being had to the accompanying drawings, making a part of this specification, in which- Figures 1 and 2 are sides views of the apparatus with a closed valve. Fig. 3 is a side view ofa section of the apparatus, showing the valve open. Figs. 4 and 5 are transverse sections taken vertically. Fig. 6 is a detached section.

Like letters of reference refer to like parts in the several views.

The apparatus or inhaler, as above said, consists of a flexible mouth-piece or cup, A, adapted to fit on over the mouth. That the edges of the cup may come in close contact with the face for being made gas-tight therewith, a notch, B, is made in the edge thereof to accommodate the nose.

In thecrown of the cup is inserted one end of a tube, 0, over the end of which is fitted a cap, D, provided with a circumferential series of perforations, a, Figs. 3 and 5. In the head of the cap are openings E, Fig. 6, the purpose of which will presently be shown.

Between the end of the tube and the head of the cap is a valve, F. Said valve consists of a thin piece of mica, which, however, may be of any other material suitable; but mica is preferred, as it is easily kept clean and not subject to decay. The diameter of the said valve is such as to allow it to move freely in the cap, and of which the end of the tube is the valve-seat.

That the valve may have a broad bearingsurface for being made gas-tight when closed, an elastic or a non-elastic bushing is inserted in the end of the tube to give it thickness, for the purpose above said, as seen at G in Figs. 4. and 5.

The device for opening and closing the valve is constructed as follows: To the outside of tube O are secured a pair of springs, I) c, Fig. 2. Projecting from the side of the tube and between the said springs is a bracket, H. holding loosely one end of a valverod, I. The opposite end of the rod passes through a boss on the side of the cup and into said cup, wherein it is connected to the valve-cap D by an arm, J, substantially as shown in Fig. 3, for actuating the cap and "alve.

The end of the valve-rod, in passing through the side of the cup, is thereby held and guided in position conjointly with the bracket H. Also projecting from the side of the tube, and between the springs and c, is a stud, d, to which is pivoted one end of an arm, K, the extreme end of which below the pivotal point is in contact with the springs, and is thereby actuated in one direction, after being actuated by the hand in the opposite one for moving reciprocally the valve-rod I, for opening and closing the valve F by actuating the cap D. Said arm is attached to the valve-rod by a pin, 6, passed through the arm and through a loop, L, Figs. 2 and 3, made in the valve-rod and forming an integral part thereof.

M, Fig. 1, is a cap tightly fitted to a boss formed on the side of the cup A. The opening in the boss is covered by a mica valve, t, of which the said boss is the seat.

The valve is free to move in the cap for opening and closing the bore of the boss, as and for a purpose hereinafter shown. Said cap and valve are substantially the same as the cap and valve E and F above described.

The practical operation of the device is as follows: To the tube 0 is attached a hose (not shown in the drawings) leading from a vessel containing the gas to be inhaled. The mouth-piece or cup A is then applied to the mouth of the patient and pressed closely thereon to secure a close contact of the cup to the face to prevent leakage. The operator now opens the valve F by pushing outward with the finger the arm K from the position shown in Fig. 1 to that shown in Fig. 3. This outward movement of the arm causes the pin 6 to press down upon the lower side of theloop L, thereby pushing downward the valve-rod, and consequently the cap D, from its position shown in Fig. 4, in which it is seen pressed closely upon the end of the tube by the head of the cap, to the position shown in Fig. 5, in which the cap is moved away from the valve, so that it may move freely in the cap for opening and closing the valve-aperture.

At each inspiration of the patient the valve opens and allows the gas to till the cup, which enters therein through the perforations ct. The valve at this time is forced from its contact with the end of the tube, (the valve-seat,) by the pressure of gas, so far therefrom as to permit the gas to pass out of the perforations into the cup to be inhaled by the patient. At the same time the valve t' in the side of the cup closes by the external pressure of the air exerted upon it through the opening a, Fig. 1, in the head of the cap M, thereby prevel'iting the escape of gas from the cup while being drawn therein by the inspirations of the patient, and at the same time excluding the air from mingling with the gas in the cup.

At each inspiration of the patient the operator closes .the cap I) upon the end of the tube by releasing the pressure on the arm K. The springs band 0 will then act upon the end of the arm and force it from the position seen in Fig; 3 to that seen in Fig. 1, thereby closing the valve, shutting off a further tlow of gas into the cup.

This shutting the cap upon the end of the tube is in consequence of pushing upward the valve-rod I by the pin 0 acting upon the upper side of the loop, as in the former case it impinged upon the lower side of the loop for opening the cap.

It is not essential to close the cap at each inspiration of the patient. The cap may remain open, as seen in Fig.5, as the valve will close upon its seat by the expiration of the patients breath, which will force the valve back upon its seat, and at the same time forcing the valve 1' back from its seat, so that the expired breath may escape from the cap through the perforations a in the side thereof, and therefore not enter the tube or be reinhaled by the patient.

To prevent the escape of gas from the cup around the valve-rod on opening the valve, the shoulder b on the rod will embed itself in the elastic boss, and thereby prevent leakage.

What I claim as my invention, and desire to secure by Letters Patent, is

In combination with the flexible mouth-piece and tube-cap D and valve, the valverod I, constructed with a loop, L, pivoted arm, and pin 0, inserted in said loop for opera-ting the rod I and valve-cap, and springs, in the manner substantially as set forth, and for the purposes specified.

In testimony whereofI affix my signature in presence of two witnesses.

HUTSON k- HURD.

Witnesses:

J. H. BURRIDGE, GEO. BERGESON. 

